hottest day to come coming up later on in the broadcast >>> campaign 2012 president obama and mitt romney prepping for their first debate next week the running mates were campaigning in battleground states joe biden in florida telling voters the republicans want to change medicare meanwhile paul ryan hammered the obama administration on the economy >>> they don't want to tell you the not for medicare there for a thing i call a voucher care >>> as a result of the most predictable economic crisis and not fixing it our credit rating was downgraded for first time in our history >>> the candidates are honing debate techniques run it will get help from ohio senator rob portman who will play obama and for the president's preparations senator john kerry will stand in for romney. cub manager brown vetoes a bill to ban agencies from disrupting cellphones service without court order, it targeted bart, which sparked a free-speech debate when it cut cellphones service in san francisco to disrupt the planned protest, the governor said it could divert attention from a true emergency by requiring court a